arch/powerpc/platforms/52xx/mpc52xx_gpio.c

   1 /*
   2  * MPC52xx gpio driver
   3  *
   4  * Copyright (c) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <linux/of.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/of_gpio.h>
  24 #include <linux/io.h>
  25 #include <linux/of_platform.h>
  26
  27 #include <asm/gpio.h>
  28 #include <asm/mpc52xx.h>
  29 #include <sysdev/fsl_soc.h>
  30
  31 static DEFINE_SPINLOCK(gpio_lock);
  32
  33 struct mpc52xx_gpiochip {
  34         struct of_mm_gpio_chip mmchip;
  35         unsigned int shadow_dvo;
  36         unsigned int shadow_gpioe;
  37         unsigned int shadow_ddr;
  38 };
  39
  40 /*
  41  * GPIO LIB API implementation for wakeup GPIOs.
  42  *
  43  * There's a maximum of 8 wakeup GPIOs. Which of these are available
  44  * for use depends on your board setup.
  45  *
  46  * 0 -> GPIO_WKUP_7
  47  * 1 -> GPIO_WKUP_6
  48  * 2 -> PSC6_1
  49  * 3 -> PSC6_0
  50  * 4 -> ETH_17
  51  * 5 -> PSC3_9
  52  * 6 -> PSC2_4
  53  * 7 -> PSC1_4
  54  *
  55  */
  56 static int mpc52xx_wkup_gpio_get(struct gpio_chip *gc, unsigned int gpio)
  57 {
  58         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  59         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  60         unsigned int ret;
  61
  62         ret = (in_8(&regs->wkup_ival) >> (7 - gpio)) & 1;
  63
  64         pr_debug("%s: gpio: %d ret: %d\n", __func__, gpio, ret);
  65
  66         return ret;
  67 }
  68
  69 static inline void
  70 __mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  71 {
  72         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
  73         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
  74                         struct mpc52xx_gpiochip, mmchip);
  75         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
  76
  77         if (val)
  78                 chip->shadow_dvo |= 1 << (7 - gpio);
  79         else
  80                 chip->shadow_dvo &= ~(1 << (7 - gpio));
  81
  82         out_8(&regs->wkup_dvo, chip->shadow_dvo);
  83 }
  84
  85 static void
  86 mpc52xx_wkup_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
  87 {
  88         unsigned long flags;
  89
  90         spin_lock_irqsave(&gpio_lock, flags);
  91
  92         __mpc52xx_wkup_gpio_set(gc, gpio, val);
  93
  94         spin_unlock_irqrestore(&gpio_lock, flags);
  95
  96         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
  97 }
  98
  99 static int mpc52xx_wkup_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 100 {
 101         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 102         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 103                         struct mpc52xx_gpiochip, mmchip);
 104         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 105         unsigned long flags;
 106
 107         spin_lock_irqsave(&gpio_lock, flags);
 108
 109         /* set the direction */
 110         chip->shadow_ddr &= ~(1 << (7 - gpio));
 111         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 112
 113         /* and enable the pin */
 114         chip->shadow_gpioe |= 1 << (7 - gpio);
 115         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 116
 117         spin_unlock_irqrestore(&gpio_lock, flags);
 118
 119         return 0;
 120 }
 121
 122 static int
 123 mpc52xx_wkup_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 124 {
 125         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 126         struct mpc52xx_gpio_wkup __iomem *regs = mm_gc->regs;
 127         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 128                         struct mpc52xx_gpiochip, mmchip);
 129         unsigned long flags;
 130
 131         spin_lock_irqsave(&gpio_lock, flags);
 132
 133         __mpc52xx_wkup_gpio_set(gc, gpio, val);
 134
 135         /* Then set direction */
 136         chip->shadow_ddr |= 1 << (7 - gpio);
 137         out_8(&regs->wkup_ddr, chip->shadow_ddr);
 138
 139         /* Finally enable the pin */
 140         chip->shadow_gpioe |= 1 << (7 - gpio);
 141         out_8(&regs->wkup_gpioe, chip->shadow_gpioe);
 142
 143         spin_unlock_irqrestore(&gpio_lock, flags);
 144
 145         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 146
 147         return 0;
 148 }
 149
 150 static int __devinit mpc52xx_wkup_gpiochip_probe(struct platform_device *ofdev,
 151                                         const struct of_device_id *match)
 152 {
 153         struct mpc52xx_gpiochip *chip;
 154         struct mpc52xx_gpio_wkup __iomem *regs;
 155         struct gpio_chip *gc;
 156         int ret;
 157
 158         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 159         if (!chip)
 160                 return -ENOMEM;
 161
 162         gc = &chip->mmchip.gc;
 163
 164         gc->ngpio            = 8;
 165         gc->direction_input  = mpc52xx_wkup_gpio_dir_in;
 166         gc->direction_output = mpc52xx_wkup_gpio_dir_out;
 167         gc->get              = mpc52xx_wkup_gpio_get;
 168         gc->set              = mpc52xx_wkup_gpio_set;
 169
 170         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 171         if (ret)
 172                 return ret;
 173
 174         regs = chip->mmchip.regs;
 175         chip->shadow_gpioe = in_8(&regs->wkup_gpioe);
 176         chip->shadow_ddr = in_8(&regs->wkup_ddr);
 177         chip->shadow_dvo = in_8(&regs->wkup_dvo);
 178
 179         return 0;
 180 }
 181
 182 static int mpc52xx_gpiochip_remove(struct platform_device *ofdev)
 183 {
 184         return -EBUSY;
 185 }
 186
 187 static const struct of_device_id mpc52xx_wkup_gpiochip_match[] = {
 188         {
 189                 .compatible = "fsl,mpc5200-gpio-wkup",
 190         },
 191         {}
 192 };
 193
 194 static struct of_platform_driver mpc52xx_wkup_gpiochip_driver = {
 195         .driver = {
 196                 .name = "gpio_wkup",
 197                 .owner = THIS_MODULE,
 198                 .of_match_table = mpc52xx_wkup_gpiochip_match,
 199         },
 200         .probe = mpc52xx_wkup_gpiochip_probe,
 201         .remove = mpc52xx_gpiochip_remove,
 202 };
 203
 204 /*
 205  * GPIO LIB API implementation for simple GPIOs
 206  *
 207  * There's a maximum of 32 simple GPIOs. Which of these are available
 208  * for use depends on your board setup.
 209  * The numbering reflects the bit numbering in the port registers:
 210  *
 211  *  0..1  > reserved
 212  *  2..3  > IRDA
 213  *  4..7  > ETHR
 214  *  8..11 > reserved
 215  * 12..15 > USB
 216  * 16..17 > reserved
 217  * 18..23 > PSC3
 218  * 24..27 > PSC2
 219  * 28..31 > PSC1
 220  */
 221 static int mpc52xx_simple_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 222 {
 223         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 224         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 225         unsigned int ret;
 226
 227         ret = (in_be32(&regs->simple_ival) >> (31 - gpio)) & 1;
 228
 229         return ret;
 230 }
 231
 232 static inline void
 233 __mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 234 {
 235         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 236         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 237                         struct mpc52xx_gpiochip, mmchip);
 238         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 239
 240         if (val)
 241                 chip->shadow_dvo |= 1 << (31 - gpio);
 242         else
 243                 chip->shadow_dvo &= ~(1 << (31 - gpio));
 244         out_be32(&regs->simple_dvo, chip->shadow_dvo);
 245 }
 246
 247 static void
 248 mpc52xx_simple_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 249 {
 250         unsigned long flags;
 251
 252         spin_lock_irqsave(&gpio_lock, flags);
 253
 254         __mpc52xx_simple_gpio_set(gc, gpio, val);
 255
 256         spin_unlock_irqrestore(&gpio_lock, flags);
 257
 258         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 259 }
 260
 261 static int mpc52xx_simple_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 262 {
 263         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 264         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 265                         struct mpc52xx_gpiochip, mmchip);
 266         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 267         unsigned long flags;
 268
 269         spin_lock_irqsave(&gpio_lock, flags);
 270
 271         /* set the direction */
 272         chip->shadow_ddr &= ~(1 << (31 - gpio));
 273         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 274
 275         /* and enable the pin */
 276         chip->shadow_gpioe |= 1 << (31 - gpio);
 277         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 278
 279         spin_unlock_irqrestore(&gpio_lock, flags);
 280
 281         return 0;
 282 }
 283
 284 static int
 285 mpc52xx_simple_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 286 {
 287         struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 288         struct mpc52xx_gpiochip *chip = container_of(mm_gc,
 289                         struct mpc52xx_gpiochip, mmchip);
 290         struct mpc52xx_gpio __iomem *regs = mm_gc->regs;
 291         unsigned long flags;
 292
 293         spin_lock_irqsave(&gpio_lock, flags);
 294
 295         /* First set initial value */
 296         __mpc52xx_simple_gpio_set(gc, gpio, val);
 297
 298         /* Then set direction */
 299         chip->shadow_ddr |= 1 << (31 - gpio);
 300         out_be32(&regs->simple_ddr, chip->shadow_ddr);
 301
 302         /* Finally enable the pin */
 303         chip->shadow_gpioe |= 1 << (31 - gpio);
 304         out_be32(&regs->simple_gpioe, chip->shadow_gpioe);
 305
 306         spin_unlock_irqrestore(&gpio_lock, flags);
 307
 308         pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
 309
 310         return 0;
 311 }
 312
 313 static int __devinit mpc52xx_simple_gpiochip_probe(struct platform_device *ofdev,
 314                                         const struct of_device_id *match)
 315 {
 316         struct mpc52xx_gpiochip *chip;
 317         struct gpio_chip *gc;
 318         struct mpc52xx_gpio __iomem *regs;
 319         int ret;
 320
 321         chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 322         if (!chip)
 323                 return -ENOMEM;
 324
 325         gc = &chip->mmchip.gc;
 326
 327         gc->ngpio            = 32;
 328         gc->direction_input  = mpc52xx_simple_gpio_dir_in;
 329         gc->direction_output = mpc52xx_simple_gpio_dir_out;
 330         gc->get              = mpc52xx_simple_gpio_get;
 331         gc->set              = mpc52xx_simple_gpio_set;
 332
 333         ret = of_mm_gpiochip_add(ofdev->dev.of_node, &chip->mmchip);
 334         if (ret)
 335                 return ret;
 336
 337         regs = chip->mmchip.regs;
 338         chip->shadow_gpioe = in_be32(&regs->simple_gpioe);
 339         chip->shadow_ddr = in_be32(&regs->simple_ddr);
 340         chip->shadow_dvo = in_be32(&regs->simple_dvo);
 341
 342         return 0;
 343 }
 344
 345 static const struct of_device_id mpc52xx_simple_gpiochip_match[] = {
 346         {
 347                 .compatible = "fsl,mpc5200-gpio",
 348         },
 349         {}
 350 };
 351
 352 static struct of_platform_driver mpc52xx_simple_gpiochip_driver = {
 353         .driver = {
 354                 .name = "gpio",
 355                 .owner = THIS_MODULE,
 356                 .of_match_table = mpc52xx_simple_gpiochip_match,
 357         },
 358         .probe = mpc52xx_simple_gpiochip_probe,
 359         .remove = mpc52xx_gpiochip_remove,
 360 };
 361
 362 static int __init mpc52xx_gpio_init(void)
 363 {
 364         if (of_register_platform_driver(&mpc52xx_wkup_gpiochip_driver))
 365                 printk(KERN_ERR "Unable to register wakeup GPIO driver\n");
 366
 367         if (of_register_platform_driver(&mpc52xx_simple_gpiochip_driver))
 368                 printk(KERN_ERR "Unable to register simple GPIO driver\n");
 369
 370         return 0;
 371 }
 372
 373
 374 /* Make sure we get initialised before anyone else tries to use us */
 375 subsys_initcall(mpc52xx_gpio_init);
 376
 377 /* No exit call at the moment as we cannot unregister of gpio chips */
 378
 379 MODULE_DESCRIPTION("Freescale MPC52xx gpio driver");
 380 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
 381 MODULE_LICENSE("GPL v2");
 382